Boiler



V. L. JONES March 19, 1929.

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BOILER Filed 001;. 21; 1925 Sheets-Sheet 6 (III/I Inventor.- Vina'enill. Jones,

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ueurso sirerssv PATENT emery VINCENT L. JONES, OF NEW HAVEN, CONNECTICUT, ASSIGNOE, TO MGCLELLON LOCO- MOTIVE BOILER COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAS- SACHU'SETTS.

BOILER.

Application filed October 21, 1925. Serial No. 63,886.

This invention relates to locomotive boilers and in particular to that type of boiler having a water tube firebox and the ob ect is to provide a boiler of this nature which is particularly simple, efficient and durable.

My invention will best be understood by reference to the following description of an illustrative embodiment thereof shown by way of example in the accompanying drawings, wherein:

Fig. 1 is a side elevation of the firebox;

2 and 3 are enlarged sections on the lines 22 and 3-3 of Fig. 1, respectively, 1llustrating more particularly the insulation of the firebox walls;

Fig. 1- is a side elevation of the firebox w th the insulation and some of the supportmg means therefor removed;

1 Fig. 5 is a rear end elevation of the firebox with the support-ing frame-work which 1s illustrated in Fig. 4 removed;

Fig. 6 is a central longitudinal section through the firebox, combustion chamber and a portion-of the rear end of the barrel;

Fig. 7 is an enlarged section on the line 77ofFig.6;

Fig. 8 is an enlarged detail view on the line S8ofFig.7; v

Fig. 9 is a section on the line 9-9 of Fig. 8;

Fig. 10 is a section of the tube sheet on the line 10-10 of Fig.7;

Fig. 11 is a view showing in elevation the rear side of the throat chamber with the foundation chamber removed;

Fig. 12 is a section on the line 12-12 of Fig. 11 on an enlarged scale; and u Fig. 13 is an enlarged section on the line 13-43 of Fig. 11. i

The form of boiler herein disclosed resembles in many respects that disclosed in the patent to James M. McClellon, No. 1,248,356, dated Nov. 27, 1917, and in a certain sense mav be considered an improvement and develbpment of the boiler there described. Be-

' fore describing in detail the construction of the boiler herein shown, I will first briefly indicate the principal parts in order to give a generalunderstanding of the structure. Referring, therefore, to Fig. 6, the boiler may comprise the'usual barrel 15 havmg the customary fines and tubes and closed at 1ts rear end by the rear tube sheet 17. The firebox comprises a crown chamber denoted generally by'the numeral 19 and preferably formed of a plurality of cylindrical drums as lllllS-.

her being lined with tubes 23 curved to the, contour of the barrel and opening at their upper ends to the crown chamber 19 and having communication at their lower ends through the extension of the barrel shell with a distributing chamber 25 formed from a plate secured marginally to the barrel shell in a manner best shown in Fig. 7, said chamher having communication with the barrel through the shell forwardly of the tube sheet 17 and at 1ts rear end passing through a forward throat sheet 27 which in cooperation with the throat sheet 29 and base bar 30 forms .a throat chamber at the rear of the barrel extension. The firebox proper isformed in cooperation with the crown chamber 19 by a.

foundation chamber or hollow mud ring 31,

conveniently in) the form of a single U-shaped steel casting of generally tubular section having sides or legs entering the throat chamber and defining the outline of the side and rear walls of the firebox. Preferably as shown the foundation chamber 31 as a whole slopes upwardly and rearwardly and extends rearwardly beyond the rear end of the crown chamber 19 to provide for an upwardly and forwardly sloping rear wall of the firebox.

The sides of the firebox may comprise thin walled cylindrical tubes 33 ranged in substantial contact side by side and having reduced ends entering the upper part of the foundation ring 31 and the side walls of the crown chamber 19 and expanded therein while the rear wall, generally speaking, may comprise similar tubes 3d, although conveniently tubes somewhat smaller indiameter, ranged in a generally similar manner to form the rear wall although as the description proceeds it will be understood that-the construction of the rear Wall is somewhat different from that of the side walls. v

Having thus'reviewed in a general way the principal elements of the boiler as shown,

clusive. The crown chamber is preferably formed of a plurality of cylindrical drums and I have herein shown two lateral drums 35 and a central drum 37. These drums, as clearly shown in Fig. 7, have flattened sides fitting together in inwardly and downwardly converging planes so that the central drum 3'? fits between the drums 35 in the manner of a keystone and the lower peripheries of the drums may extend substantially to a common plane as illustrated. Except for their flattened cont-acting sides, through which communication between the drums is pro vided for and where the pressure is, of course, balanced, the cylindrical and inherently pressure-resisting form of the drums is not altered. The forward ends of the drums are not swaged or flanged in any manner and to eliminate working of the drums and consequent cracks and to bring all shearing stresses within continuous straight lines so far as possible the upper peripheries of the drums, as

. shown in Figs. 6 and '7, extend rearwardly in line with the rear end of the barrel shell, the circles of the drums being substantially tangent to the circle of the barrel shell interiorly of the latter as shown in Fig. 7. To eflect this the tube sheet 17 may be provided with a peripheral forwardly extending flange 39 (see Figs. 9 and 10) fitting within the end of the barrel 15 and a suitable opening to receive the three drums, which opening extends substantially to the line of the flange 39, is provided by bending forwardly a flange 41 encircling this opening, which flange 411 receives the ends of the drums 35 and 37 and may be riveted thereto as clearly shownin Fig. 9, suitable welding being applied as 1ndicated at 43 in Fig. 7 to the reentrant angles of the crown chamber.

As already explained and as shown in Fig. 6, the barrel shell is preferably carried rearwardly as a segmental extension 21 to provide the combustion chamber and to aid in supporting the crown drums, the edges of this segmental extension being inbent-and riveted to the drums, as shown in Fig. 8. It will be clear that the joints between the drums and the flanges 41 on the tube sheet are readily accessible for calking except where the extension 21 overlaps the tube sheet flanges at the right and left sides where the drums enter the tube sheet. To facilitate attention at this point the extension. may be cut away as indicated at 45 (see Figs. 6 and 8) to permit calking the seam adjacent the points of tangency of the lateral drums The recess formed by this cut-away portion would open the combustion chamber and permit gases to escape direct to the lagging of the boiler and therefore a cover plate 47 is provided to seal the opening, this plate being removable to permit any attention to the tube sheet drum flanges which may be necessary. The form of this plate is sufficiently clear from the drawings, particularly Figs.

8 and 9, it being provided with suitable flanges to seat on adjacent parts of the structure to form the desired closure and to hold it in position studs 49 may be applied, as indicated, to the extension 21 of the barrel shell and to the flange 41 of the tube sheet. The

. pansion and contraction due to the fact that the tubes are filled with hot water; The ends of the tubes are reduced and rolled and headed in the upper wall of the mud ring 31 and in the lateral drums 35 respectively. To facilitate this operation the ends of the tubes are presented perpendicularly and radially to the section of the mud ring and likewise radially of the drums 35, the upper ends of the tubes being suitably bent, as indicated in Fig. 5, to provide for such presentation. Since, as already described, the mud ring 31 preferably slopes upwardly and rearwardly, as indicated in Fig. 6, proper presentation of the side wall tubes thereto may be eifected by giving each tube a downward and rearward slope or rake as indicated in Fig. 6. Several advantages are thereby obtained "and to certain of these I will now reter'briefly.

Referring to Fig. 6, it will be seen that it is desired to havea downwardly and rearwardly sloping rear wallfor the firebox and this implies a certain triangular opening at the sides of the box. The raking of the tubes considerably diminishes the size of this opening as comparedwith tubes disposed vertically and it may be substantially closed as herein shown by a single section of tube 51 rolled and expanded into the foundation ring 31 and having a cut-away side fitted and welded to the adjacent side wall tube and communicating therewith through openings in the walls of thelatter. Still referring to Fig. 6, it will also be noted that the upper end of the foremost of the tubes 32 is disposed substantially vertically above the throat chamber formed by the plates 29 and 27 at the termination of the extension 21 of the barrel shell, the series of tubes 23 and 33 at this point being substantially uninterrupted. Due to the rake of the tube, however, an opening is provided adjacent the throat chamber, which opening provides for and facilitates the connection of the mud ring 31 to the throat sheet 29 in a manner later to be described.

. tubes, however, are disposed substantially in a plane and define the rear wall of the firebox. As seen in Fig. 5, the cyllndrlcal form of the crown drums 1s preferably unimpaired adjacent the rear of the firebox. The rear wall tubes 34 are likewise entered radially both in the foundation chamber 31 and the drum walls and for this purpose they may be suitably bent as shown to facilitate the installation, the relatively small diameter of the tubes facilitating this bending. To provide adequate metal in the drum walls between the holes receiving the ends of the tubes the upper ends may be staggered as indicated. In the lateral portions of the rear wall the tubes 34 extend uninterrupted between the drums 35 and the foundation chamber 31, but I have herein shown the central portions of certain of the tubes bent laterally to overlap adjacent tubes thereby to define openings 53 through the rear wall providing access to the firebox and in the illustrative example providing for the accommodation of the distributor tubes of an automatic stoker. In the central portion of the rear wall suitable provision is made for a fire door opening and in the embodiment of the invention shown the sides of the fire door opening are formed by two large tubes 55 opening at their lower ends to a box-like structure 57 erected on and communicating with the foundation chamber 31. The upper portion of the fire door may be formed by a header 59 comprising a flattened tube extending between and communicating with the upright tubes 55. The upper ends of the tubes 55 and the header 51 are connected by small tubes 34" with the central drum 37, these tubes being presented radially Cil to the drum and expanded and beaded therein as is the case with the other wall tubes.

To give a proper strength to the firebox structure to permit it to resist the racking strains which it encounters in use and to relieve the firebox tubes of any structural loads other than those occasioned by reason of their containing hot wat *i' under pressure, the crown chamber comprising the drums 35 and 37 is preferably definitely supported from the foundation chamber 31, as well as by the extension 21 of the barrel already described, independently of the. water-containing tubes. This'is particularly advantageous in the example illustrated because the raking or sloping disposition of the side wall tubes already described obviously would render them less etlicient as supports for the crown as compared with tubes set in vertical planes. The support of the crown may conveniently be efiected in the. manner shown in Fig. at. I

have therein shown the crown chamber as supported from the foundation ring by means of suitable pillars disposed at intervals around the firebox as, for example, pillars 61 and 63 at each side and pillars 65 at the rear end, the structure being similar to that more fully disclosed in a copending application of myself. and William L. Bea-n, F 63,877, filed October 21, 1925. As more fully described in that application, the mud ring 31 may have cast integrally therewith steps or brackets 67 and to the crown drums may be secured suitable bracket-like castings 69 and 71 by means of fitted bolts. The members 69 and 71, as clearly shown in Fig. 4, present shoulders and lips receiving the ends of the vertical braces or pillars such as 61 and 63, relieving the bolts of shearing action and preventing working of the parts.

,To give horizontal stillness to the framework the pillars 61 and 63 at the sides of the boiler may be connected by a brace 73 and a arace plate 75 may extend entirely across the back end of the firebox, being secured to the pillars 65 at that end, around the rear corners of the firebox and be connected to the pillars 63' at that side. This plate 75 may extend across the fire door opening and the open'ngs 53 and may provide a support independent of the tul es for receiving the majority of the important cab fittings or locomotive accessories which are customarily applied in the back head region in the firebox. Thus, they may support the fire door and the tire door screen, the distributor tubes of the Stoker when a stoker is used and other fittings such as air brake and valve control equiprent, tool and oil-can holders and the like.

The supporting frame-work just described may also be utilized for supporting in the serial No.

most convenient manner the insulation of the firebox. The construction will be most readily understood by reference to Figs. 1, 2 and 3. Referring to Fig. 2, the tubes of the firebox as 33 are lagged externally with cement 77 which may be applied to a wire mesh 7 9 some what in the manner of plaster, the whole be ing covered with a sheet of asbestos paper 81. This lies internally of the frame-work supporting the crown from the foundation chamber. The members of the frame-work irovide for supporting the jacket for insulating the firebox and also for what I willcall protection plates disposed exteriorly of the tubes. Referring to Fig. (3, it will be seen that adjacent the ends of the tubes spaces are provided due to their reduced ends. It is desirable to provide externally of these a backing for the cement 79 to prevent possible accidents which might arise if the cement were blown out from these spaces. In the present embodiment of the invention the whole side of the firebox is backed up by a metal plate and I have herein shown it as formed in sec tions or panels which may be applied and removed together with the insulating jacke which is likewise formed in panels. Retorring to Fig. 1, suitable plates 83, varying in size and structure in accordance with the situation, may beattached to the foundation chamber 31 and to the various elements of the supporting frame-work as 75 and 3 and the larger open spaces forwardly of the pillar (35 maybe divided longitudinally conveniently by means oi angle irons 85 extending between the pillar 61 and the extension 21 of th* ban rel shell and betwcenthe pillars 63 and 6 or secured along the edges of the brace 73, thus defining frame-like openings or recess in which the protecting and insulating panels may )0 placed. 'llhese panels may be constructed as shown in detail in Fig. 3 and com prise a metal protecting plate 8? with which is organized the layer 0t insulating felt 89 enclosed in a jacket 91 and as shown in that figure these panels may be detachably secured to the flanges oi? the angle irons 85 by the bolts 93 applied marginally. ln 1 the reference numeral has been applied only to the bolts in the central .tion. The projecting portions of the plates 83 serve likewise to receive attaching bolts in the same manner as the flanges oi the angle irons 85, as will be clear from Fig. l at the left hand side thereof. The panels along the upper part of the side walls are shown secure-d at their upper end to angles 95 suspended at opposite sides 01 the firebox by straps 96 passing over the jacketing of the crown drums.

I will next describe the connection of the mud ring 31 to the throat chamber and will refer particularly to Figs. 6, 11 and 12. The throat chamber comprises a rear throat sheet 29 secured to the rearmost end of the barrel shell and a forward sheet 27 likewise secured to the barrel shell and flanged to receive the distributing chamber 25. T he two sheets bent over one another on the sides to term a lap seam (see Fig. 13). As shown in Fig. 12, the roar sheet 29 may be provided witlran opening having a rearwardly extending flange 97 which, as shown in Fig. 6, extends into the space defined at the roar of the throat chamber by the rake or slant of" the most forward side wall tube 33. The end of the mud ring 31, preferably somewhat re duced as shown, is received within the flange 97. The space provided by the slope of the tube make; this joint readily accessible for being made tight, tor inspection and for repair. The throat sheet' 2? may also be llangod rearwardly at 99 in line with the opening receiving the toundation ring, thus providing a hand hole in line therewith and the inwardly directed flange 99 terms a seat tor a hand hole cover 101 which may be drawn down on its seat by means of the nut 103 cooperating with the cross bar 105 bridging the opening in the forward threat sheet.

In Figs. 11 and 13 l have illustrated a pretel-red method of closing up the throat chamber at the upper corners thereof. As shown in Fig. 13, a tiller plate 107 is Welded in place by the peripheral line of welding 109 and the lap seam between the two throat plates 27 and 20. is smoothed down by scarfing and welding to produce smooth outside edges. A flanged cap 111 is then applied over the tiller plate 107 with its flanges overlapping the sheets 27 and 29. This is applied hot and fitted intoplace and the screw rivets 113 applied to secure the flanges in position. The edge of the cap may then be welded to the extension 21 to complete the closure. The upper corners of the throat chamber closed by the method just described maybe vented to some one of the steam spaces of the boiler as by means oi. a pipe 115 illustrated in Fig. 11.

l have described in detail the construction of boiler shown in the accompanying drawings as a preferred example of my invention. Obviously, however, various of the features described might be used in other combinations and connections and the mechanical construction might be widely varied without depart ing from the fundamental ideas. The particularity of the description has had for its purpose making clear the construction illus trated and is not to be understood as a definition or limitation of the scope of the invention. Vi hat ll claim as new and desire to secure by Letters Patent 1 shall express in the following claims.

Claims:

1. A locomotive firebox comprising a longitudinally extending crown chamber having cylindrical side walls, an upwardly and rearwardly inclined mud ring and side walls comprising tubes entered perpendicularly to the top wall of the mud ring and raking upwardly and forwardly and having upper onus bent and entered radially through said cylindrical surfaces.

2. A locomotive firebox comprising a longitudinally extending crown chamber havcylindrical side walls, an upwardly and rearwardly inclined mud ring extending rearwardly beyond said crown chamber to provide for an upwardly and forwardly inclined rear wall and side walls comprising tubes entered perpendicularly to the top wall or the mud ring and raking upwardly and forwardly and having upper ends bent and entered radially through said cylindrical surfaces.

3. A locon'iotive. firebox comprising a crown chamber, a throat. chamber, a mud ring having sides extending rearwardly from the throat chamber and upwardly inclined therefrom and side walls comprising closely arranged tubes extending between the mud ring and crown chamber, said tubes being entered perpendicularly through thetop of the former and raking upwardly and forwardly and providing a space adjacent the throat chamber wherein the sides of the mud ring are connected thereto.

4. A locomotive firebox comprising a crown chamber having cylindrical side walls, a throat chamber, a mudring having sides extending rearwardly from said throat chamber upwardly inclined therefrom and extend ing rearwardly beyond the crown chamber to provide for a forwardly and upwardly sloping rear wall and side walls compris ng closely arranged tubes entered perpendlcularly through the mud ring and radially through the cylindrical walls of the crown, said tubes extending in substantially unbroken series throughout the sides of the crown and raking rearwardly and downwardly therefrom to approximate at the rear the slope of said rear wall and at the front to provide adjacent the throat chamber a space wherein the sides of the mud ring are connected thereto.

5. A. locomotivfe firebox comprising a crown chamber, a throat chamber, a mud ring having sides extending rearwardly from the throat chamber and beyond the crownchamber to provide for an upwardly and rearwardly sloping rear wall and side walls comprising closely arranged tubes extending between the mud ring and the crown chamber and raking upwardly and forwardly to aparox'imate at the rear the slope of said rear wall and at the front to provide adjacent the throat chamber a space wherein the sides of the mud ring are connected thereto. s

6. A locomotive li rebox comprising a longitudinally extending crown chamber having cylindrical side walls, an upwardly and rearwardly inclined foundation chamber, rigid pillars supporting the tormer from the latter and side walls comprising closely arranged, upwardly'and forwardly raking tubes extending between foundation chamber and crown chamber and entered perpendicularly through the upper wall of the former and radially through the cylindrical walls of the latter.

'1". A locomotive firebox comprising a longitudinally extending crown chamliier having cylindrical side walls, a mud ring extending rearwardly beyond said crown chambento provide for an upwardly and forwardiy 1nclined rear wall, *igid pillars supporting the crown chamber from the foundation chamher and side walls comprising closely arranged, upwardly and forwardly raking tubes extending between toundatlon chamber and crown chamber and approximating the 111- clination or said rear wall, said tubes entering perpendicularly to the top wall pf the mud ring and having their upper ends bent and entered radially through said cylindrical side walls.

8. A locomotive firebox comprising a crown chamber, a throat chamber, a hollow mud ring having sides extending to said throat chamber, walls comprising closely ar ranged tubes extending. between the crown chamber and mud ring" and rakingrearwardly and downwardly from the former,

the forward tube of aside wall entering the crown chamberat a point substantially over the throat and by virtue of the raking thereof defining a space at the rear of the throat, the

rear wall of the throat chamber having a flanged extension into said space to receive the side of the mud ring.

9. A locomotive firebox comprising a crown chamber, a throat chamber, a hollow mud ring having sides extending to said throat chamber, walls comprising closely ar ranged tubes extending between the crown chamber and mud ring and raking rearwardly and downwardly from the former, the forward tube of a side wall entering the crown chamber at a point substantially over the throat and by virtue of the raking thereof defining a space at the rear of the throat, the rear wall of the throat chamber having a flanged extension into said space to receive the side of the mud ring and the front wall of the throatchamber having a hand hole aligning with said side.

10..In a locomotive boiler a barrel, a flue sheet at the rear thereof, a crown comprising drums entered through said sheet and substantially tangent to the barrel, the barrel shell having a rearward segmental extension secured to the sides of said drums, said extension being cut away adjacent the flue sheet providing access to the joint between drum and barrel.

11. In a locomotive boiler a barrel, a flue sheet at the rear thereof, a crown comprising drums entered through said sheet and substantially tangent to the barrel, the barrel shell having a rearward segmental extension secured to the sides of said drums, said extension being cut away adjacent the flue sheet providing access to the joint between drum and barrel and a removable cover for the cutaway portion sealing the opening between cess to the jointbetween flanges and drums.

13. In a locomotive boiler in combination with abarrel shell, a throat chamber comprising front and rear sheets secured to said shell and connected to provide side walls for said chamber and flanged caps fitting over said sheets having their flanges connected thereto to close said chamber between said side walls and the shell.

14. In a loeomotiveboiler in combination with a barrel shell, a throat chamber comprising front and rear sheets secured to said shell and connected to provide side walls for said chamber, filler plates received between'said name to this specification.

sheets to close said chamber between the said side Walls and the shell and members over- 10 lying said plates and having flanges lapping over and secured to said sheets.

In testimony whereof, I have signed my VINCENT L. JONES. 

